A quick look at the differences in the video quality between the Panasonic GH4 and Samsung NX500 in low light.
1600 and 3200 ISO was used at 1/60th to get the results from both 4k capable cameras.
Samsung NX500 Key Specs
Announcement Date: 2015-02-06
28MP – APS-C BSI-CMOS Sensor
ISO 100 – 51200
Samsung NX Mount
3? Tilting Screen
9.0 fps continuous shooting
4096 x 2160 video resolution
Built-in Wireless
287g. 120 x 64 x 43 mm
Panasonic GH4 Key Specs
Announcement Date: 2014-02-07
16MP – Four Thirds CMOS Sensor
ISO 200 – 25600
Micro Four Thirds Mount
3? Fully Articulated Screen
2359k dot Electronic viewfinder
12 fps continuous shooting
4096 x 2160 video resolution
Built-in Wireless
560g. 133 x 93 x 84 mm
Weather Sealed Body